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mark0311 8th June 2005 11:47 PM

2 way speaker kit upgrade advice
Purchased 2 way Peerless DIY bookshelf system from the web. Construction first class but find the system harsh especially in treble area/higher freq. Would like some advice on upgrading ie tweeter/crossover design etc.


woofer... peerless 850122 6.5 CSX176H
tweeter..peerless 811827 25mm Dome Tweeter DT 100.
rear vented, impedance 8ohms
Freq response 40Hz-20khz -3/+2db
sensitivity 88db
crossover freq 2700Hz
type 2nd order (12Db/octave) bessel filter
solen SCR capaictors,non-inductive resitors
dimensions 470 H x 220 W x 325 D 25mm mdf
full cabinet bracing,panel damping
volume 19 liters
port diameter 50mm
port length 90mm
port tuning freq 43hz

Timn8ter 9th June 2005 05:45 PM

It looks like you want to rework the crossover. Do you have measurement equipment?

mark0311 9th June 2005 08:45 PM

Re-working the crossover is probably the first step... I don't have measuring equip but new to this so happy to be steered in the right direction.... cheers mark

DcibeL 9th June 2005 10:46 PM

2 Attachment(s)
Wow, it's unreal how much those speakers are equal to the pair of bookshelfs I built. There are a couple differences:

I use 2700Hz butterworth filter instead of bessel.
I use the non-ferrofluid version of the tweeter.

Either way, I thought I would help out a little by posting my crossover schematic. If your tweeter uses a simple L-pad for the attenuation, all you need to do is change 2 resistors to lower the tweeter level to something less harsh. I use 5dB of attenuation on the tweeter.

2-Way Crossover Network
Low-Pass (LP) Filter: 1 required
Type: 2nd-Order Butterworth
Desired Corner Frequency: 2700 Hz
High-Pass (HP) Filter: 1 required
Type: 2nd-Order Butterworth
Desired Corner Frequency: 2700 Hz
C1 = 6.8 F, Polypropylene, 0.0003 ohms
C2 = 5.1 F, Polypropylene, 0.0002 ohms
L1 = 0.51 mH, Air Core(#16), 0.33 ohms
L2 = 0.68 mH, Air Core(#16), 0.38 ohms

Impedance EQ
Req = 6.8 ohms
Ce = 2.1 F
L-Pad: 5.00 dB
Rp1 = 2.407 ohms
Rp2 = 7.067 ohms

Impedance EQ
Req = 7.5 ohms
Ce = 22 F

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